- "Finished" sequence.h, there's more to do, but the basic functionality is there

- bintree.h is implemented according to the needs of sequence.h at present

test/tests/containers/test_sequence.h

@@ -51,7 +51,10 @@ inline void fennec_test_containers_sequence() {
 
 	for (size_t v : ref) {
 		assertf(test.contains(v), "Failed Sequence Test!");
+		test.erase(v);
 	}
+
+	fennec_test_run(test.empty(), true);
 }
 
 }